When using IE6 behind an ISA Proxy the file upload sometimes fails after multiple uploads. This is a SiteFinity site using a FileUpload control. Here is a screenshot: http://www.programgood.net/fileuploadBug.png
I've made the file upload simple. ie it only does 1 at a time, then renders the page to show a thumbnail of the recently uploaded photo.
Here is what I got back from the admin:
"Looking at our Proxy Server, the monitor shows Windows Authentication being used to make the connection at the start, but then it changes to Anonymous and The ISA Server goes, denied (can't have unknowns accessing the Internet).
By-Pass the Proxy Server (ie: make a direct connection to the Internet) and all works well. From my perspective, I can make a rule to allow this website direct access on our side, but it's not ideal and only resolves the problem for the CCC.. I'll be expecting this same issue with any other business working behind an ISA box."
Does this ring any bells, and any advice on where to start debugging?